Sliding clasp fastener



Dec. 22,1942, K NA 2,305,623

I SLIDING CLASP FASTENER Original Filed June 29, 1940 4 Sheets-Sheetl A ATTORA/E) J. KUNA SLIDING CLASP FASTENER Original Filed June 29, 1940 4 Sheets-Sheet 2 Dec.- 22,, 1.942- J. KUNA 2,305,623

- SLIDING CLASP FASTENE'R Original Filed June 29, 1940 4 she'ets-s heet3 J. KUNA 2,305,623

SLIDING CLASP FASTENER Original Filed June 29, 1940 4 Sheets- -Sheet;'4

Patented Dec. 22, 1942 s PATENT OFFICE.

SLIDING CLASP FASTENER Josef Kuna, Oxford, England, assignor of onehalf to Brevetia Limited, London, England, a

British company Originalapplication June 29, 1940, Serial No. 343,060. Divided and this application July 22,

1941, Serial No. 403,471. In Great Britain uary 22, 1940 Jan- , 6 Claims. (01. 24-205) This patent application is divided out of my co-pending patent application Serial No. 343,060,

' metallic stop members for such sliding clasp fasteners.

Other objects and advantages of the invention will become apparent from the sub-joined detailed description taken in conjunction with the accompanying drawings in which Fig. 1 is a view of one form of acomplete sliding clasp fastener embodying the invention,

Figs. 2, 3 and 4 are perspective views illustratzlgnig steps in the manufacture of the fastener of Fig. 5 is a view in greater detail of one of the fastening members of the fastener of Fig. 1,

Fig. 6 is a perspective view of part of a stop member at the open, upper, end of the sliding clasp fastener of Fig. 1,'

Figs. 7 and 8 are perspective views showing both sides of part of the stop member at the closed, lower end of the fastener of Fig. -1,

Figs. 9 and 10 are more detailed views' respectively of the upper and lower end of the fastener of Fig. 1 in closed position,

Figure 11 is a view of another form of a compilete sliding clasp fastener embodying the invenon, i

Figures 12, 13 and 14 are perspective. views illustrating steps in the manufacture of the fastener of Figure 11,

Figure 15 is a view in greater detail of one of the. fastening members of the fastener of Figure 11,

Figure 16 stop member at the open, upper end of the sliding clasp fastener of Figure 11,

Figures 17 and 18 are perspective views shows ing bothsides of part of the stop member ,at the is a perspective view of a part of a. f

,during the gluing process.

tapes l0 or other flexible supports each having attached to it a series of fastening members denoted generally by Hi spaced longitudinally along the edge I4 of the tape, which edge isshown as being beaded or thickened. A pair of stop members denoted generally by It are provided at the open, upper, end of the fastener, one attached to each tape l0, and a'single stop member I1 is attached to both tapes at the closed, lower, end of the fastener. The members I3 are provided with coupling projections I8 and corresponding recesses l9 (shown more clearly in Fig. 5), the projection l8 of a member l3 on one tape being adapted to be brought into and out of interlocking engagement with a recess IQ of an adjacent member It on the other tape by means of a slider 20 of conventional construction to close and open the fastener in known manner. The fastening members l3 and the stop members I6 and I! are madeof non-metallic material such as Celluloid or other cellulosic material (e. g, cellulose acetate) Bakelite or analogous plastic material.

, Difficulties. have been experienced hitherto in* attaching to the tape of a sliding clasp fastener members made of non-metallic material of the character just mentioned. Securing such members by glue or other adhesive necessitates extreme care to-avoid the tapes becoming soiled Resort to castin moulding, or press-forming the members on the tapes in situ has the defect that the choice of shape for the coupling projections and recesses is restricted owing to the fact that the recesses have to correspond in shape to the projections and have to be so shaped that the mould or the like used for forming the members can be easily removed notwithstanding the fact that the memformed independently and subsequently joined to the first part, for example by means of an adhesive, the coupling projections and recesses being provided substantially on the second part.

Fig. 2 illustrates the tape .l0 on to which are cast in situ parts 2 l. Each part II surrounds the beaded edge ll of the tape II and has a recess 22 and 9. lug 23. Y In order to enable a-plurality of parts 21 to be formed simultaneously around Referring first to Figs. 1 to 10, the sliding clasp fastener illustrated comprises a pair of similar theedge ofthe tape III at the correct distance from each other,-each lug 23 has an extension 24 connected to a rod-like member 25 ascertaining .the distance between the parts 2| and enabling 2 v all the parts 2| to be formed by means of a common mould. It will be seen that the parts 2| are not provided with coupling members.

. Fig. 3 shows a plurality of parts 26 having lugs 21 adapted to fit into the recesses 22 of the parts 2|. The parts 26 are connected together to form a strip of parts b means of extension 28 connected to a rod-like member 36 which ascertains suitable means such as acetone. After the parts 26 have been joined to the parts 2| the lugs 24 together with the rod 25 and the lugs 28 together with the rods 60 are cut off.

The stop members l6 consist also of two parts, one part being a part 2|, the other part 33 having the shape illustrated in Fig. 6. It possesses 2 a lug 34 adapted to fit into the recess 22 of the part 2| and a recess 35 accommodating the lug 23 of the part 2|. It will be appreciated that in the manufacture of a stringer, the part 2| for the stop member I6 may be formedsimultaneously withthe parts 2| for the fastening members proper, and the part 33 of the stop member may be formed simultaneously with the parts 2l| of the fastening members. The part 33 is joined and adhesively secured to its corresponding part Fig. 9 shows the upper part of the fastener in its closed position, the slider being omitted.

The stop member "at the closed end of the fastener is made by joining a bridge-like member 36 (see Figs. 7, 8 and 10) to parts 42 and 43 which are in shape identical with the parts'Zl. Each member 36 has lugs and AI adapted to fit into recesses 44 and 45 of the parts 42 and 43. The bridge member 36 is joined and and adhesively secured to the parts 42 and 43.

Figs. 11 to 20 illustrate a secondembodiment of the sliding clasp fastener according to this inven- 65 so as to. fit into the recess 56 of a part 55. As will be more clearly appreciated from Figs. 14

and 15, the parts 62 are joined to the parts 55 and adhesively secured thereto by any suitable means, the lugs 51 closing at one side the recesses 53 and 54 of the parts 62. Subsequently the lugs 66 and 63, together with the rods 6| and 64 are cut oif.

Again, the stop member 66 at the open end of the fastener is formed of two parts 55 and 61 (see Figs. 16 and 19).

The stop member 61 at the closed end of the fastener comprises three parts, two parts bein parts 55, connected together by a bridge member I0 (see Figs. 17, 18 and 20) While I have shown and described in this specification two embodiments which my invention may assume in practice, it should be clearly understood that this description is only for the purpose of illustration and that other forms may occur to those skilled in the art.

What I claim is:

1. An interlocking member for sliding-clasp fasteners comprising two non-metallic complementary parts adhesively secured together one of said parts having a lug and a recess, and the other part having a coupling recess and'a couplingprojection and 9. lug engaging said recess of said one part. i

2. An interlocking member as defined in claim 1 wherein said other partcomprises one coupling projection only and a coupling recess open at one side of said other part. said lug on said one part closing the open side of said coupling recess.

3. In a sliding clasp fastener, an interlocking member comprising two complementary parts made of plastic material and adhesively secured together, one of said parts having a lug, a recess and means for embracing an edge of a flexible support for securing the members thereto, and

the other part having a coupling recess, a cou' pling projection and a lug engaging said recess ofsaid one part.

tion. Whereas each fastening member of the sliding clasp fastener according to Figs. 1-10 has one coupling recess and a corresponding coupling around its beaded edge l5 (see Fig. 12), each ible supports, a stop member for the closed end part having a stepped recess 56 and ing 51 provided with an extension 66 joined to a connecting rod 6|. 'Again, the parts 55 do not possess any coupling projections and recesses.

' Fig. 13 shows a strip of parts 62 each having two projections-5| and 52 and two recesses 61 and 64. Extensions 63 connect each part 62 to a rod 64. Each part 62 is stepped as indicated at 4. In a sliding clasp fastener, an interlocking member comprising two complementary parts made of plastic material, means for securing'the member to an edge of a flexible support on one of said parts and an interlocking recess and projection on the other of said parts. said parts being provided with complementary means keying said parts together.

member as defined in claim 4 and wherein a lug is provided on said first part for forming a side wall on the interlocking recess of the other part to partially close the same.

6. In a sliding clasp fastener the interlocking members of which are made of plastic material and are attached to adjacent edges of two flexof the fastener comprising two parts each attached to one of said adjacent edges, a bridgelike member, and complementary means on said parts and said member fixing the correct relative position of said parts and said member, said member beingadhesively secured to said Darts.

. JOSEF KUNA. 

